Method for the production of benzene carboxylic acids and benzene dicarboxylic acid esters

US4908471A · kind A · utility

Assignee

• Huels Troisdorf AG · DE

Inventors

• Hans Leuck · Troisdorf, DE
• Hans-Jorg Westermann · Troisdorf, DE

Key dates

• Filing date: Feb 16, 1988
• Grant date: Mar 13, 1990
• Expiry date: Feb 16, 2008

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00126
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Disclosed is a method for the production of benzene carboxylic acids and benzene carboxylic acid esters or their mixtures, while p-toloylic acid is made from p-xylene and terephthalic acid monomethyl ester is simultaneously prepared from p-toluylic acid ester. The oxidation is performed by the addition of oxidator liquid and gases containing oxygen in single orifice mixing nozzles with the formation of a highly disperse reaction phase and the single orifice mixing nozzles open into the oxidator liquid.